http://nopr.niscpr.res.in/handle/123456789/62875 2026-10-11T12:12:20Z http://nopr.niscpr.res.in/handle/123456789/62890 Title: Biosynthesized silver nanoparticles using green chemistry approach and its evaluation as antifungal agent Authors: Patanjali, Neeraj; Kumar, Randeep; Chopra, Indu; Patanjali, Pooja; Kaushik, Ruchi; Sharma, Surendra Kumar Abstract: Silver nanoparticles (Ag-NPs) have emerged as potential antifungal agents due to their exceptional properties. These nanoparticles can be synthesised in the laboratory by using green synthetic methods. Hence, in the present study dark brown colour Ag-NPs have been synthesized from 0.01 mM AgNO3 using Azadirachta indica leaf extract as a reducing agent and characterised via different spectroscopic and microscopic techniques. The average particle sizes of the synthesized Ag-NPs are found to be 36 nm and all the particles are mostly spherical in shape. These biosynthesized Ag-NPs effectively have mitigated the mycelial growth of F. oxysporum and F. moniliforme. However, the inhibition has been found better for F.oxysporum as compared to F. moniliforme. At 500 ppm concentration of Ag-NPs, the reductions in mycelial growth havebeen found to be 100 and 80% for F. oxysporum and F. moniliforme, respectively. So, it can be concluded from the studythat Ag-NPs prepared from A. indica leaf extracts could be explored for developing fungicidal formulations. Page(s): 741-745 2023-11-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/62889 Title: Mixed convection flow over non-Darcy porous stretching/shrinking sheet Authors: Kumar, Laltesh; Singh, Atar; Sharma, Kushal; Joshi, Vimal Kumar Abstract: An investigation has been carried out on heat and mass transport phenomena for mixed-convection flow over a vertically non- Darcy Forchheimer porous stretching/shrinking sheet considering the Soret - Dufour effects. With consideration of the appropriate similarity framework, the fundamental governing flow equations are converted into a system of non-dimensional equations. The bvp4c, a built-in solver of MATLAB software, is utilized to compute the numerical results of the flow problem. The present model is validated with previously published literature. The impacts of several related flow parameters on velocity, temperature, and concentration profiles have been displayed graphically. Also, the mass and heat transfer rates along with the coefficients of skin friction are calculated and discussed numerically. It is found that an increment in the thermal radiation parameter increases the fluid temperature, and the concentration gradient boosts up for the enhancement of the Soret number. Page(s): 746-752 2023-11-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/62888 Title: Synthesis, characterization and application of Lignosulphonate-g- poly(sodium acrylate) hydrogel Authors: Manu; Gupta, Rajinder K.; Kumar, Devendra Abstract: Natural polymer-based hydrogels are of great interest to research community owing to their inherent characters of environment friendliness and biodegradability. Current work aims to synthesize lignosulfonate grafted sodium acrylate hydrogel (LS-g-SAH) and investigate its application in urea release behaviour. The hydrogel has been characterized by different techniques. The release kinetics has been analyzed by using a UV-visible spectrophotometer. The optimized composition of lignosulfonate, KPS, and N,N’-MBA has shown the highest water absorbency of 560 g g-1 in distilled water. The equilibrium swollen LS-g-SAH 12 hydrogel has slowly released 60% of loaded urea in 24 h and followed first-order release kinetics. Soil treatment with hydrogel has shown a significant effect in reducing the water evaporation rate. It also improved the seed germination and average height of wheatgrass. The synthesized LS-g-SAH is, thus, expected to have potential application in modern sustainable agriculture. Page(s): 753-764 2023-11-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/62887 Title: Effect of CuO nano additive with novel punnai methyl ester in a TBC CI engine Authors: Vadivel, A; Vinoth, R Abstract: The requirement for petroleum fuel has amplified due to the growth of automobile industries and population growth. To meet fossil fuel demand in the future, alternative fuel for diesel fuel is necessary. The technique for engine modification is also considered as the latest advance in engine research aimed to complete combustion. The engine has been coated with a mixture of a ceramic thermal barrier material of 88% Yttria Stabilized Zirconia (YSZ), 4% Magnesium oxide (MgO), and 8% Titanium oxide (TiO2) of 150 μm thickness by the plasma spray process. After engine modification, the coated engine has been analyzed with the mixing of Copper oxide (CuO) nanoadditive to the B20 Punnai Methyl Ester. The structural and chemical constituents of the biofuel are determined using Fourier transform infrared spectroscopy and gas chromatography. The test result noted that brake thermal efficiency is increased by 17.14% for the coated engine as compared to the uncoated engine. The brake specific fuel consumption for the tested fuel used in the coated engine is decreased by 11.16%. Engine emission parameters are reduced especially oxides of nitrogen (NOx) emission of 10.84% for the tested fuel in the coated engine. Page(s): 765-779 2023-11-01T00:00:00Z